Carbon wrench



FIG. 1 is a perspective view of the end of the inventive carbon wrench;

FIG. 2 is a plan view of the end of the wrench, looking from the left-hand end, as viewed in FIG. 1;

FIG. 3 is a plan view of the end of the wrench, looking from the right-hand end, as viewed in FIG. 1; and

FIG. 4 is a side elevation view of the inventive wrench, with a handle (which does not constitute part of the invention) shown in dot-dashed lines. 

The ornamental design for a carbon wrench, as shown and described. 